<Trimming tons of detail, but keeping the thread>
OK.... I've reproduced the original issue on a seperate box.
2.6.23-rc3 does not like to grow Raid 5 arrays. MDadm 2.6.3
mdadm --add /dev/md0 /dev/sda1
mdadm -G --backup-file=/root/backup.raid.file /dev/md0
(Yes, I added the backup-file this time... just to be sure.)
Mdadm began the grow, and stopped in the critical section, or right
after creating the backup... Not sure which. Reboot.
Refused to start the array. So...
mdadm -A /dev/md0 /dev/sd[abdefg]1
and we have in /proc/mdstat:
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdg1[0] sda1[5] sdf1[4] sdd1[3] sdb1[2] sde1[1]
1953535488 blocks super 0.91 level 5, 128k chunk, algorithm 2
[6/6] [UUUUUU]
[>....................] reshape = 0.0% (512/488383872)
finish=378469.4min speed=0K/sec
unused devices: <none>
And it's sat there without change for the past 2 hours. Now, I have a
backup, so frankly, I'm about to blow away the array and just recreate
it, but I thought you should know.
I've got the stripe_cache_size at 8192... 256 and 1024 don't change anything.
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